Merge pull request #2600 from edx/ormsbee/enable_browser_attr_insights

Send front-end PageView custom metrics to New Relic Insights.

playbooks/roles/newrelic/templates/etc/newrelic/nrsysmond.cfg.j2

@@ -231,3 +231,9 @@ labels={{ labels }}
 #          path if, for example, you have multiple CGroup mounts.
 # Default: Distribution dependent, but usually /sys/fs/cgroup or /cgroup.
 #cgroup_root=
+
+# Allow custom attributes to be sent to Insights for browser PageViews
+#
+# https://docs.newrelic.com/docs/agents/python-agent/installation-configuration/python-agent-configuration#browser-settings
+#
+browser_monitoring.attributes.enabled = true